{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["Chemical"], "input": "Poly ( vinyl alcohol ) Physical Hydrogel Nanoparticles , Not Polymer Solutions , Exert Inhibition of Nitric Oxide Synthesis in Cultured Macrophages ."}
{"Chemical": ["Poly ( vinyl alcohol )", "Nitric Oxide"]}